Surface-gage



(No Model.)

J. CARR. SURFACE GAGE.

No. 468,093. Patented Feb. 2, 1892'.

WITNESSES; l. 7 INVENTOR.

% (g @M BY @i mbifl ATTORNEY-J UNITED STATES PATENT OFFICE.

JAMES CARR, OF SYRACUSE, NE\V YORK.

su RFACE-GAG E.

SPECIFICATION forming part of Letters Patent No. 468,093, dated February2, 1892.

Application filed June 6, 1891. Serial No. 395,371- (No model-l To aZZwhom, it may concern.-

Be it known that I, JAMES CARR, of Syracuse, in the county of Onondaga,in the State of New York, have invented new and useful Improvements inSurface-Gages, of which the following, taken in connection with theaccompanying drawings, is a full, clear, and exact description.

My invention relates to surface-gages and scribers, and especially tothat class in which the needle is mounted and adjustable upon a standardwhich can be tilted sidewise by the turning of the pivotallymountedstandardholder.

My object is to produce an improved gage by which the point of theneedle can be swung over onto the top of the work, the base beingstationary for gage-work, or movable either upon straight or curved workfor scribing either a straight line or a on rve,by which the point ofthe needleis vertically adjustable by the rotation of an eccentricacting upon and moving the standard in order to obtain closeradjustment, in which the base can be fitted upon and moved along theedge of a planer-bed or in any of the longitudinal or transverse slotsor grooves therein, in order to scribe a line parallel with one of suchgrooves.

My invention consists in the several novel features of construction andoperation hereinafter described, and which are specifically set forth inthe claims hereunto annexed. It is constructed as follows, referencebeing had to the accompanying drawings, in which- Figure 1 is a sideelevation of the gage, showing the standard tilted or inclined, and alsoshowing by the dotted lines the movement imparted to the needle andstandard by the rotation of the eccentric to obtain close and fineadjustment. Fig. 2 is a sectional front elevation of the gage, omittingthe needle. Fig. 3 is a bottom plan view of the rocking bar and of theeccentric mounted in a slot in the arm thereon to throw off theeccentric, being shown by the small circle in dotted lines, the otherdotted lines indicating the body of the eccentric and the slot. Fig. lis a like view of the same parts, showing the re taining-flange out offfrom the eccentric. Fig. 5 is a sectional elevation on line a; a: inFig. 3 or on a line longitudinal to the standard in Fig. 2. Fig. 6 is adetailshowingin sectional elevation the jaw-piece, the standard, and theeyebolt and thumb-screw. Fig. 7 is a transverse vertical section of thebase on liney y, Fig. 1, across the notch. Fig. 8 is a top plan of theflanged or rabbeted portion of said base.

A is the base having a flange 1 on one side and vertical walls 2 atright angles to the plane of the upper face of said flange, and a boss3, adapted to receive an eyebolt 4, parallel with the base, said bolthavingathuinbscrew 5 upon its outer end,which bears against the outerface of said boss. This bolt passes through the jaw-block 6, therock-bar 7, and said boss, and the vertical standard 8 passes throughthe eye of said bolt, and when the thumb-screw is tightened up thestandard fits in the V-jaw, (see dotted lines in Fig. 6,) the jaw isdrawn tightly against the rock-bar, and this bar lies against the faceof the boss 3, and said standard is suppported by means of this bolt.Upon the standard Imount the adjustable needle-carrier 9 and needle 10of any desired construction. The rock-bar 7 is provided with an arm 11at right angles to the body thereof, and said arm is provided with anelongated slot having parallel sides and rounded ends, in which theeccentric 12 fits freely and is retained by means of a collar 13, asshown in Figs. land 4. Thiswhole eccentric is in the form of a thumb-nuthaving an outer head 14: and a neck, which is the eccentric 12, in thatthe hole 15 through itis eccentric thereto, but not necessarily to thehead. The base is also provided with an angular notch 16, by means ofwhich I can cause it to bear against a rounded surface.

When used as a surface-gage, I place the base alongside of the objectwith the standard more or less inclined, tilting it upon the pivot-bolt1 until the point of the needle is close to the surface to be gaged.Then by turning the eccentric I lowerthe needlepoint into fineadjustment and touch contact with the surface of the object and thenmove the base along said object, noting the operation i IOU resting uponthe walls 2, and then slide the base-block along, scratching a line withthe needle-point, and by shifting the needle or standard also I can drawa line or lines parallel with the first line.

lVhen I wish to drawa curved line parallel with the edge of a curved orcircular object, I place the notch 16 against the edge and the walls 2on the top thereof, and then having adjusted the needle-point I slidethe base around the edge, and thus scribe a curve parallel with theedge, thus, for instance, locating the line upon which holes are to bedrilled at a certain fixed distance from the edge.

What I claim as my invention, and desire to secure by Letters Patent, is

1. The combination, with the standard supported by the base and theneedle carried by the standard, of a base-block havinga flange on oneside, and a Vertical wall at right angles to said flange, and a V-shapednotch in the upper face of said flange.

2. The combination, with the base and the eyebolt through it, of therock-bar pivoted upon said bolt, and the jaw-block upon said bolt, theeccentric mounted in said rock-bar, the standard passing through theeccentric and said eyebolt, and the needle carried by the standard,

3. The combination, with the needle-carrying standard and the jaw-blockand eyebolt holding it and constituting its pivotal support, of aneccentric receiving said standard

